Robert Hugh McClellan (January 3, 1823 – July 23, 1902) was an American politician, attorney, and banker from New York City.
McClellan attended private schools and Union College before heading west to Galena, Illinois to practice law.
There, he became the president of a bank and director of a woolen mill.
He was elected as a Republican to a term in the Illinois House of Representatives in 1860 and then to the Illinois Senate, where he served two terms, in 1876.